Earless ghost swift moths become “invisible” to echolocating bats by forming mating clusters close (less than half a meter) above vegetation and effectively blending into the clutter of echoes that the bat receives from the leaves and stems around them.

(figuratively) Anything that gradually and silently eats, consumes, or wastes any other thing.

So that, dear lords, if I be left behind, / A moth of peace, and he go to the war, / The rites for which I love him are bereft me, / And I a heavy interim shall support / By his dear absence. Let me go with him.